Answer:
An entity is an abstract category or grouping of things that share a common quality, and an instance, is a particular form or type of the entity.
In a barbershop, the main entities would be:
- Barbers
- Hair Cutting instruments
- Furniture
And some instances for each entity would be:
- Barber - Barber A, Barber B, Barber C, each representing a different person.
- Hair Cutting instruments - razors, blades, clips.
- Furniture - chairs, counter, mirrors, brooms, bulbs.
